Wrench.



R. JJONES a?. H. GNHIEGHAM.

y WRENCH. AI LIOATIOH FILED APB. 18, 1901.

u 898,8Qe. i

Panama sept.15,.19os.'

Nalseasoe.

UNITED STATES PAIIENT RICHARD J. JONES .-"iXD FRANK H. CUNNINGHAM, OF SEBRIXG" OHIO.

WRENCH.

To allV whom it may concern.: I

Be it known that we, RICHARD J. JONES and FRANK H. CUNNINGHAM, citizens'of the United States, residing atA Sebring, in the 'county of Mahoning and State of Ohio, have mvented certain new and useful Improvements in lVrenches, of which the following is a specification. I

'lhc invention relates more particularly to wrenches for pipes, tubes. nuts and the like.

Objects of the invention are to enhancethe utility of devices ot' the character stated by causing the jawsl to take a firmer hold upon the object to which tue tool may be applied, and providing a construction wherein there is little or no strain on the threads of the adjusting screw. f

To these and other ends the invention resides in the improvements referred to and defined in the ap ended claims.

The nature, c iaracteristic features and sco e of the invention will be more clearly un erstood from the following detailed description, taken in connection with the accompanying drawings, forming a part hereof, wherein- Figure 1, is a perspective view of a wrench embodying features of the invention. Fig. 2 is a view of the wrench principally in longitudinal section; and Fig. 3, is a section on hvided at its inner end with a fixed jaw 01 head 2, and at its other end with a suitable hand iece 3. The bar or shank '1, is preferably a orging and isformed or provided near its head with cheek- )ieces 4, which accommodate a stud or fulcrum pin 5, on which the adjusting screw 6, is mounted so as to have some rocking movement.

7, represents the movable jaw and as shown it is bored at S, to permit the passage of the screw 6, on which it slides- Referring to Fig. 3, it will be observed that the. opening 8, is larger than is necessary for the passage of the screw. This is advantageous in that it rovides for some lost motion thus cnab ing the. aws not to respond as promptly as they otherwise would to the action of the screw.

' 9, represents the usual adj usting nut. The nut 9, 1s carried b v and engages the threads on the screw 6. The jaw T, is recessed at l0, and the nut 9, takes into said recess and one side bears against one of the walls thereof and on the other side bears against the up- Speccation of Letters Patent. appncaaan sied April 1e, 1907. v, serial No. 368,540.

Patente segu 15, 1,908.

turned partA or lug 11, through,"which the screw passes. Thus it follows tha the jaw 6, will move in one or the other direction ac-A cording to the adjustment of the mit 9.

12, is the usual spring interposed, between the wrench bar and the movable jaw and tendine' to direct the latter towards t-,hie` c0mplementary fixed jaw.

\` Referring to Fig. 2, which shows the tool applied, it will be observed that the shank of the movable jaw abuts against the bossiil, of t-he screw, which relieves the strain "on said jaw.

In practice we contemplate making the toothed surfaces of the jaws in the form of hardened tool steel inserts'lt, which makes for economy.

Having described the nat-ure and objects of the invention, what we claim as new and desire to secure by Letters fatent is 1. A wrench comprismg ashank or bar havmfr a xed head or aw and a rocknifJr or b 1 a pivotal screw, a movable jaw interposed between said iixed jaw and the iulcrumed part of the screw an-d slidably mounted on said screw, and a nut adapted to advance or retract said movable jaw, substantially as specified.

2. A wrench comprising a shank or bar provided with a fixed head or jaw, cheek ieces projecting from said bar and having a ulcrum pin or stud, a screw mounted on vsaid stud, a movable jaw interposed between said fixed jaw and the fulcrumed partotl the screw and having a lug bored to permit the passage of said screw and slidable on said screw, and a nut carried by the screw and adapted to advance or retract the movable jaw, substantially as specified.

3. A wrench comprising lixed and movable jaws, a'rocker fulcrumed on the ii'xcd jaw, said movable jaw being interposedbetween the fixed jaw and the fulcrumed part of the rocker and adapted to bear against said ful crumed part when under working strain, and means carried by the rocker for advancing or retracting the movable aw, substantially as specified.

4. A wrench comprising fixed and movable jaws, a screw fulcrumed on the fixed jaw, said movable jaw being interposed between said fixed jaw and the fulcrumed part of the screw, adapted to bear on the fulcrumed part of the screw and having a lug slidably mounted on the screw with a recess adjacent said lug, and a nut carried by the screw and engagng said recess, whereby the movable jaw 1s caused to res ond to adjustments of the nut, substantial y as specified.

5. A Wrench compnslng a shank or bar 5 having a fixed head or jaw and a rocking orpivotal screw, a recessed movable 'aw interposed between 'che fixed jaw an the fulcrumed part of the rocker or screw and. shdably mounted on said screw, a-nut carried by 10 said screw and penetrating said recess, Where- 

